Mechanism for truing holes



April 20, 1943. E. MATTSON MECHANISM FOR TRUING HOLES Filed Sept. 24, 1941 2 Sheets-Sheet l April 20, 1943. E. MATTON 2,316,879

MECHANISM FOR TRUING HOLES Filed Sept. 24, 1941 2 Sheets-Sheet 2 Patented Apr. 20, 1943 U N IT ED 2 STATE S PAT E PF"! CE r MECHANISM FOR TRUING' HOLES Emil-Mattson; Chester Depot, Vt.,- assigno'r to Bryant Ch'ucking ---Grinder Company? Springfield; Vt'., a corporation of Vermont 1 Application September 24, 1941, Serial No."41"2,1 65

'7 Claims. (01. 51-18423 This invention relates to mechanism for truing holes to render themaccurately cylindrical and with their axes inpredetermined relation to other' parts. For example, such mechanism may be A further object is to provide zimprovedmeans for adjusting the axis of the hole finishing mechanism by which this axis is brought into a pref determined relationship to otherzpartsr For a more complete understanding ofathis in-" vention, reference may behad't'o thea'ccompany ing drawings in which Figure 1 is a perspective 'view ofa hone em bodying certain ;of the features-of this inven- I tion.

Figure 2 is a central longitudinal .cross sec-' tion of the hone of Figure 1 shown inwork having a pair of spaced bores which are to bebrought' into axial alinement; thisiview showing axisad' justing mechanism.; 1

Figure 3. is a fragmentary left handelevation o'f i the work shown'ain :Figure 2 and showing the axis adjusting mechanism.

Figures 4 andv 5 are'detail sectional views;

Figure .5 being to 'a .larger scale, on section lines 4-4 and 5--5, respectively 'of Figure 2;

Figure 6-is a detailisection on line '66 of Fig ure 5.

Figure 7 is a fragmentary central ".section through an'engine cylinder of a block showingthe hone of Figure 4 applied-thereto. V

Figure 8 is a fragmentary dia'grammaticlongitudinal sectional .viewof an engine'cylinder showi ing in full line van improperly positioned boreand in dotted'linethecorrected bore, the amount of correction being exaggerated for thesake of clar ity;

Figure 9 is a detaiLsection on line 9''9 of Fig ure 8 and showingthe hone'of Figure 1 within the cylinder bore and with the hone blades re-- tracted and the gage feeler projected.

Referring first to Figures 1 to 4, at ?i is indicated a cylindrical'bodyctmember having a plu:-'

rality of radialslots therein within. which trlde While four such elements" cutting elements 2.

are illustrated," a greater or less number might.

be employed.-- These cutting elements may be 0f various forms; but as shown they. arehonesgeach face portion 3 carrying abrasive material, as, for example, by having abrasive material charged into itsvouter face. These elements '2 are arranged to be expansible or contractible, being contracted'so asto'permit the insertion-of the bodyportioncarrying "theminto a hole to be trued, and then expanded into contact with the inner face ofthe hole and furtherexpanded as the hole increases in diameter due to-the action of the cutting elements; This bodywith the cutting elements is arranged to be'rotated and moved axiallyto perform its desired operation on the work and-in order to support the bodyfor such rotation and axial motion, it is shown asprovided with tubu1arpilot-members 5 and 8 at opposite ends thereof and arranged coaxial therewith. 1

Any suitable: means may be-provided for re--' taining the elements 2 in-position and for expanding them to suitthe diameter of the hole in which they are to be placed. 7 As shown" they are held in assembledrelationto the body por-- tion and urged into contracted position by spring 7 rings ,1 engaging in reduced end portions 8 there-- of,v andthey may be projected outwardly as desired by'the'use of wedgeor conical blocks 1 0 se curedto anaaxially movable shaft ll 'located'in a central bore in the body l. As-shown-the'se blocks areisecured in recesses in the member II as by meansof screws l2 and they act upon inclined: wall portions "I4 'and 'l5-of recesses l6 and I! in the elements 2'. '--'I'hemember l'l may" be adjusted axially with respect to th'ebody mem her I, and for thispurpose-the end thereof toward "the larger end of the'blocks I0 is engaged by a thrust'bar *20'seated'in a bore 2| "of the pi1ot'6 andxenga'gedatits outer end bya plug 22 seated in an-zenlarged diameter portion of the bore'2l." This member 22 has threaded therein thepiloti;

For the purpose of this invention gage or feeler means are provided by which it"can'be determined by the operator when-the holewithin which the" body I and its cutters 2 is' positioned is accurately cylindrical: andthis withoufiremoving the tool from theiw orlni Thus the gaginemberis" accm; being-provided with an .external-longitudinaliisur u '-:=,r a Y- t ting elements; at an "timesand the gaging is done from the same centering and with the same setting as the finishing of the hole, .As shown the gage comprises a headed feeler element slidable through a bushing 3| threaded into a hole 32 in the body between two of the cutting elements 2. This feeler element is positioned with its shank portion 33 projecting outwardly and is normally held retracted as far as permitted, as by a coil spring 34 reacting between the head 35 of the feeler element and the base 36 of a socket in the bushing 3|. outer end of this shank 33 is rounded to form a surface which maybe projected to the desired extent until it contacts with the inner wall 40 of the hole in the work and this projection of the feeler element may be accomplished by motion of a rod 4|, one end of which is tapered as shown at 42 and engages between side shoulders 43 of the end face of the head 35. This rod 4| isprovided with a head 45. at itsopposite end and a spring 46 surrounding this element reacts between the base of the head and the base 41 of an enlarged diameter portion of a bore 48 within which the rod 4| is axially movable. tends to hold the rod 4| retracted so that the feeler element 33 is retracted and so held bythe spring 34. A plug 50 threaded into the outer enlarged end portion of the bore 48 and also through a hole 5| in an inner flanged extremity 52 of the pilot member 6 engages the head 45, and by manipulation of this plug 50 the feeler element can be projected or retracted. This plug 50 is located and accessible for adjustment from within the periphery of the body member.

When the tool is being used to aline a pair of spaced holes in work, as, for example, the holes 40 and 60 shown in Figure 2, a bushing 6| within which the pilot portion 6 of the tool may be jour- This spring The naled and of a proper size to closely fit one of I these holes as 60 is inserted in that hole. The hole 60 is then taken as the basis for the correct axial position, and the hole 40 is trued into accurate alinement therewith. The pilot 5 is then supported for rotation and axial motion in a bushing 55 and'this bushing is arranged to be adjusted laterally of the work as may be necessary to true the hole 40 into proper axial alinement with the hole 60. As shown this bushing-'55 is adiustably mounted as by screws 50 positioned in angular spaced arrangement therearound, these screws being threaded through an annular member 51 forming part of a locating plate- 58 This locating plate is firmly fixed to the' work as by means of bolts 59, which pass therethrough and through spacer sleeves 62 and are threaded into the work. The locating plate is thus firmly secured to the work and by adjustment of the screws 56 thepilot portion 5 may be brought into the correct position, taking up any spring in the pilot portions 5 and 5 so that as the truing of the hole 40 progresses, it is brought into accurate coaxial relation with the bore j After a desired amount of rotation and axial motion of the tool with the cutting elements outwardly adjusted as desired, the correctness of the truing may be tested from time to time as by the feeler element. When this is desired, the cutting elementsare retracted by proper turning of the plug 24 and the feeler element is adjusted outwardly into contact with the work. If the work is not truly cylindrical, rotation of the work with the gaging element in contact with its inner face cannot be done throughout its entire circumference but when the truing has been completed, the gagingelement when moved into contact with the engine with a crank case portion |0|. This is placed in a fixture having lower and upper parts I02 and I03, the fixture having suitable means (not, shown) for correctly locating the crank shaft center I04 and its upper portion correctly locating a bushing I05 having a hole I06 for one of the pilot portions 5 or 0 and its lower :portion having a pilot guide I08 so that when the hole is coaxial with this bushing and pilot, guide it will be exactly perpendicular to the crank shaft axis l04. The bushinglo5 is preferably of a diameter larger than that of the cylinder bore so as to permit the tool to be removed endwise from the cylinder bore through the hole which receives the bushing 15, thus to permit ready application and removal of the tool for inspection of the bore or other purpose. I

In Figure 8 is illustrated an inaccuracy in the original cylinder bore indicated in full lines, while in dot and dash lines is shown the final diameter and position of the bore correctly related to the crank shaft. This inaccuracy is shown much exaggerated, this'being for the purpose of more clearly illustrating it. 7

With the honing tool in position as shown in Figure 7, the finishing'of the interior of the cylinder bore is effected, the cutting elements being expanded from time to time as the hole is enlarged until such time as when tested byjthe feeler element the hole is truly cylindrical. At this time it will have been not only formed truly cylindrical, but in accurate perpendicular relation to the crank shaft axis so that when the engine is assembled the cylinder will be lined up properly with relation to the crank shaft.

From the foregoing description of an embodiment of this invention and certainuses 'to which it may be applied, it should be evident tothose skilled in the art that various changes and modifications might be made without departing from its spirit or scope. i Y I claim:

1. A device ofthe class described, comprising a body member, a plurality ofcuttin'g elements carried by said body member spaced angularly about its axis, means for simultaneously moving said elements from and toward the axis of said body member, a feeler element fixed during operation of the device and carried by said body member between certain of said cutting elements, and

means for adjusting said feeler element toward ?and from the axis of said body member. i

2. A device of the class described, comprising a body member, a plurality of cutting elements carried by said body member spaced angularly about its axis, means for simultaneously moving ?said elements from and toward the axis of said body member, a feeler element fixed during'operation of. the device and carried by said body member between certain of said cutting elements, an element movably carried by said body member and accessible for movement at one end of said body member, and operative connections from said movable element to said feeler element for causing movement of said movable element to adjust said ieeler element laterally with reference to the axis of said body member.

3. A device of the class described, comp-rising a body member, a plurality of cutting elements carried by said body member spaced angularly about its axis, means for simultaneously moving said elements from and toward the axis of said body member, a feeler element fixed during operation of the device and carried by said body member between certain of said cutting elements, an element movably carried by said body member and accessible for movement at one end of said body member and within the periphery thereof, and operative connections from said movable element to said feeler element for causing movement of said movable element to adjust said feeler element laterally with reference to the axis of said body member.

l. A device of the class described, comprising a cylindrical body member, a plurality of cutting elements carried by said body member spaced angularly about its axis, means for simultaneously moving said cutting elements from and toward said axis, said body member having a longitudinally extending bore at one side of said axis between a pair of said elements and a hole through the periphery of said body member intersecting said bore, a sleeve seated in said hole, a headed feeler element projecting through said sleeve and with its head inwardly disposed, a spring positioned between said head and sleeve for retracting said element, a wedge element axially movable in said bore and having a wedge face in engagement with said head to force said feeler element outwardly against the action of said spring as the thicker part of said wedge portion engages said head through axial motion of said wedge element, a spring forcing said wedge element in the reverse direction, and a member threaded through an end portion of said body member and engaging said wedge element for controlling the axial position of said wedge element, said threaded member being accessible for turning at said body member end.

5. In combination with a cylindrical body portion, cutting elements arranged about the axis of said body portion, pilot members extending coaxially from opposite ends of said body portion, bushings within which said pilot members ar journaled, a frame, means for securing said frame to the work around one end of the hole to be treated, and means for adjusting one of said bushings relative to said frame transverse to the axis of said hole.

6. In combination with a cylindrical body portion, cutting elements arranged about the axis of said body portion, pilot members extending coaxially from opposite ends of said body portion, bushings within which said pilot members are journaled, a frame having an opening therethrough larger than one of said bushings, means for securing said frame to the work adjacent to one end of the hole to be treated, and screws carried by said frame for engaging said one bushing and adjusting said one bushing laterally of the axis of said body member within said frame opening.

7. In combination with a cylindrical body portion, cutting lements arranged about the axis of said body portion, pilot members extending coaxially from opposite ends of said body portion, bushings within which said pilot members are journaled, a fixture having coaxial spaced holes for receiving said bushings and between which work to be acted on by said cutting elements may be positioned, one of said bushings being of a diameter larger than that of said body portion to thereby permit the withdrawal of said body portion from the work through the hole which normally receives and holds said one bushing.

EMIL MATTSON. 

